code: def collapse_rfc2231_value(
      value, errors="replace", fallback_charset="us-ascii"
  ):
      if isinstance(value, tuple):
          rawval = unquote(value[2])
          charset = value[0] or "us-ascii"
          try:
              return unicode(rawval, charset, errors)
          except LookupError:
              # XXX charset is unknown to Python.
              return unicode(rawval, fallback_charset, errors)
      else:
          return unquote(value)
  
imports: import os
  import re
  import time
  import base64
  import random
  import socket
  import urllib
  import warnings
  from email._parseaddr import quote
  from email._parseaddr import AddressList
  from email._parseaddr import mktime_tz
  from email._parseaddr import parsedate
  from email._parseaddr import parsedate_tz
  from quopri import decodestring
  from email.encoders import _bencode, _qencode
label_desc: Use image node_id 15 for calling a global function with example usage: collapse_rfc2231_value(value, errors, fallback_charset) and returns: unquote, unicode, unicode